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// Copyright 2024 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include <vector>
#include "pw_assert/assert.h"
#include "pw_async2/dispatcher_base.h"
namespace pw::async2 {
class Dispatcher final : public DispatcherImpl<Dispatcher> {
public:
Dispatcher() { PW_ASSERT_OK(NativeInit()); }
Dispatcher(Dispatcher&) = delete;
Dispatcher(Dispatcher&&) = delete;
Dispatcher& operator=(Dispatcher&) = delete;
Dispatcher& operator=(Dispatcher&&) = delete;
~Dispatcher() final { Deregister(); }
Status NativeInit();
enum FileDescriptorType {
kReadable = 1 << 0,
kWritable = 1 << 1,
kReadWrite = kReadable | kWritable,
};
Status NativeRegisterFileDescriptor(int fd, FileDescriptorType type);
Status NativeUnregisterFileDescriptor(int fd);
void NativeAddReadWakerForFileDescriptor(int fd, Waker&& waker) {
NativeAddWakerForFileDescriptor(
fd, FileDescriptorType::kReadable, std::move(waker));
}
void NativeAddWriteWakerForFileDescriptor(int fd, Waker&& waker) {
NativeAddWakerForFileDescriptor(
fd, FileDescriptorType::kWritable, std::move(waker));
}
private:
static constexpr size_t kMaxEventsToProcessAtOnce = 5;
struct FdWaker {
int fd;
FileDescriptorType type;
Waker waker;
};
void DoWake() final;
Poll<> DoRunUntilStalled(Task* task);
void DoRunToCompletion(Task* task);
friend class DispatcherImpl<Dispatcher>;
Status NativeWaitForWake();
void NativeFindAndWakeFileDescriptor(int fd, FileDescriptorType type);
void NativeAddWakerForFileDescriptor(int fd,
FileDescriptorType type,
Waker&& waker) {
fd_wakers_.push_back({fd, type, std::move(waker)});
}
int epoll_fd_;
int notify_fd_;
int wait_fd_;
std::vector<FdWaker> fd_wakers_;
};
} // namespace pw::async2